Dual band printed F-antenna using a trap with small band separation

A dual band inverted-F antenna comprising:

• a planar inverted-F antenna;
• and
• a trap configured to provide the antenna with both a first frequency band and a second frequency band;
• wherein the first frequency band is separated from the second frequency band by less than 100 MHz;
• and wherein the planar inverted-F antenna comprises:
• a first antenna element;
• a second antenna element connected to the first antenna element at a first connection point along the length of the first antenna element that is proximal of a distal end of the first antenna element, the second antenna element is electrically coupled to an antenna signal trace;
• a third antenna element spaced from the first antenna element by a gap, the third antenna element positioned along the length of the first antenna element proximal of the distal end of the first antenna element but distal of the first connection point;
• and
• a trap operatively coupled across the gap between the first antenna element and the third antenna element, wherein the trap includes at least one capacitor and at least one inductor.

A dual band inverted-F antenna comprising:

• a planar inverted-F antenna;
• and
• a trap configured to provide the antenna with both a first frequency band and a second frequency band;
• and
• the first frequency band includes 865-870 MHz and the second frequency band includes 905-925 MHz;
• wherein the planar inverted-F antenna comprises:
• a first antenna element;
• a second antenna element connected to the first antenna element at a first connection point along the length of the first antenna element that is proximal of a distal end of the first antenna element, the second antenna element is electrically coupled to an antenna signal trace;
• a third antenna element spaced from the first antenna element by a gap, the third antenna element positioned along the length of the first antenna element proximal of the distal end of the first antenna element but distal of the first connection point;
• and
• a trap operatively coupled across the gap between the first antenna element and the third antenna element, wherein the trap includes at least one capacitor and at least one inductor.